Variability signatures distinguish verbal from nonverbal counting for both large and small numbers

Humans appear to share with animals a nonverbal counting process. In a nonverbal counting condition, subjects pressed a key a numeral-specified number of times, while saying “the” at every press. The mean number of presses increased as a power function of the target number, with a constant coefficient of variation (c.v.), both within and beyond the proposed subitizing range (1–4 or 5), suggesting small numbers are represented on the same continuum as larger numbers and subject to the same noise process (scalar variability). By contrast, when subjects counted their presses out loud as fast as they could, the c.v. decreased as the inverse square root of the target value (binomial variability instead of scalar variability). The unexpected power-law relation between target value and mean number of presses in nonverbal counting suggests a new hypothesis about the development of the function relating number symbols to mental magnitudes.     

A multimodal behavior analytic model for evaluating the effects of medical problems on nonspecific behavioral symptoms in persons with developmental disabilities

A relationship between various medical illnesses and the frequency and severity of nonspecific behavioral symptoms such as aggression and self-injury has been described by a number of writers. None, however, provides a clinical case formulation model that articulates the specific nature of this relationship or the manner in which potential biomedical influences interact with psychological and socioenvironmental ones to determine the occurrence and strength of behavioral symptoms. A model is described in this paper that suggests possible contributions of medical illnesses or conditions to occurrence of nonspecific behavioral symptoms and provides a diagnostic basis for selecting and evaluation related interventions. © 1997 John Wiley & Sons, Ltd.     

Book reviews

The Tao and the Logos: Literary Hermeneutics, East and West. Zhang Longxi, 1992 Duke University Press xviii + 239 pp., ISBN 0 8223 1218 2, pb $14.50

Ibn Sinā and Mysticism: Remarks and Admonitions. Shams C. Inati, 1996, London, Kegan Paul International, 114 pp., ISBN 0 7103 0482 X, hb £30.00

Ethics in Early Buddhism. David J. Kalupahana, 1995, Hawaii, University of Hawaii Press, ix+ 171 pp., ISBN 0 8248 1702 8, hb $27.00

On Understanding Buddhists. Essays on Theravāda Tradition in Sri Lanka. John Ross Carter, 1993, Albany, State University of New York Press, xiv+215 pp, hb $16.95

To See the Buddha. A Philosopher's Quest for the Meaning of Emptiness. Malcolm David Eckel, 1994 (1st edn 1992), Princeton, Princeton University Press, x + 262 pp., ISBN 0 691 03773 6, pb US$ 16.95     

ON THE IMMEDIACY OF PHONETIC PERCEPTION

Abstract— If, as we believe, language is a specialization alt the way down to its roots, then perception of its consonantal elements should be immediately phonetic, not as in the conventional view, a secondary translation from percepts of an auditory sort. Supporting observations come from an experiment in which formant transitions that distinguish [da] and [gal were presented as sinusoids and combined with a synthetic syllable made of resonances, thus causing the auditory system to treat these acoustically incoherent parts as different sources Evidence for the source difference was varied by changing the intensity of the sinusoids relative to the remainder of the syllable. Over the greater part of a 60-dB range, listeners accurately identified the consonants, indicating that they had integrated the stimuli according to a coherence that existed only in the phonetic domain. At the lowest intensities, indeed, the consonants were accurately identified, even though the whistles—the normal responses to the sinusoids—were not. There followed then a range over which perception was duplex. Both consonants and whistles were accurately identified At the highest intensities, phonetic integration failed, but accurate perception of the whistles was maintained. That the phonetic percept was present when as auditory counterpart was absent, and vice versa, is evidence that the phonetic percept is independent of its auditory counterpart and not a translation from it, as is the fact that the two percepts followed very different courses in response to the experimental variable.     

The Haskins Laboratories’ pulse code modulation (PCM) system

The pulse code modulation (PCM) method of digitizing analog signals has become a standard both in digital audio and in speech research, the focus of this paper. The solutions to some problems encountered in earlier systems at Haskins Laboratories are outlined, along with general properties of A/D conversion. Specialized features of the current Haskins Laboratories system, which has also been installed at more than a dozen other laboratories, are also detailed: the Nyquist filter response, the high-frequency preemphasis filter characteristics, the dynamic range, the timing resolution for single- and (synchronized) dual-channel signals, and the form of the digitized speech files (header information, data, and label structure). While the solutions adopted in this system are not intended to be considered a standard, the design principles involved are of interest to users and creators of other PCM systems.     

ADHD treatment in the 21st century: pushing the envelope

Required for optimal intervention for attention deficit hyperactivity disorder (ADHD) is evidence-based matching of child, treatment, and situation. The landmark Multimodal Treatment Study (MTA) of Children with ADHD documented the superiority of pharmacotherapy for the vast majority of children with ADHD. Although this study could not address the problem of the match directly, it is generating important leads for research on the use of psychosocial strategies to enhance the scope and durability of treatment gains while decreasing the risks attendant upon long-term use of medication. Given the inherent distinctions between pharmacological and psychosocial treatments, conclusive answers to questions about comparative efficacy will continue to elude scientist-practitioners. Needed next is research examining ways to improve outcomes beyond the effects of medication, using systematically tailored and sequenced psychosocial approaches and exploring new treatment targets, agents, and modalities. To illustrate, some emerging findings from an ongoing experience sampling study and implications for online therapy are discussed.